Asubstance that enters earth's cycles and does harm to living things is
a. a pollutant.
b. freshwater.
c. hydrogen.
d. oxygen.

Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism

An example of a trait that would be considered acquired and inherited is a. a cleft chin b. muscle tone c. scar tissue d. freckled skin

Which best example best demonstrates the importance of having knowledge of evolutionary relationships? a. illustration of a plant b.organ transplantation between species c. blood donation from a human d. do you need sequence of an insect.